docs(redis): Update documentation to match behaviour

Roger Makramrequested to merge
rogermakram/follow-up-cleanup into master

What

In the redis package, we're adjusting:

  • a test for the behaviour where a custom secret format with an empty projection should return an error
  • the documentation that outlines that a non-nil field in the secret projection that points to a key that's absent in the secret would result in an error

Why

To address the missing review comments in !517 (merged). This is outlined in !517 (comment 3458571973)

gitlab-com/gl-infra/platform/runway/team#874 (closed)

Edited by Roger Makram

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